Dynamic category on slicer section

vin26 , you have to create a measure like this example measure and use that in conditional formatting

Color Dot = 
	var _avgDisc = CALCULATE([Discount %],ALL(Retail))
	var _avgMargin = CALCULATE([Margin %],ALL(Retail))
	return switch(TRUE(),
	[Margin %]>_avgMargin && [Discount %] <_avgDisc , "Green",
	[Margin %]>_avgMargin && [Discount %] >_avgDisc , "Blue",
	[Margin %]<_avgMargin && [Discount %] <_avgDisc , "Yellow",
	[Margin %]<_avgMargin && [Discount %] >_avgDisc , "Red", "Black")

I have explained how to do it in this webinar

https://youtu.be/Q1vPWmfI25o?t=2851

vin26 - I think it is because of your logical expressions, perhaps:

Measure = 
    var _avgDisc = CALCULATE('Midpoint1_X Axis'[Midpoint1 Value],ALL(Data))
	var _avgMargin = CALCULATE('Midpoint2_Y Axis'[Midpoint2 Value],ALL(Data))
        return 
            switch(MAX('Table'[Category]),
                "A",CALCULATE(COUNT(Data[Sl No]),FILTER(Data,[Measure_Value1]>_avgMargin && [Measure_Value2] <_avgDisc)),
                "B",CALCULATE(COUNT(Data[Sl No]),FILTER(Data,[Measure_Value1]>_avgMargin && [Measure_Value2] >_avgDisc)),
                "C",CALCULATE(COUNT(Data[Sl No]),FILTER(Data,[Measure_Value1]<_avgMargin && [Measure_Value2] <_avgDisc)),
                "D",CALCULATE(COUNT(Data[Sl No]),FILTER(Data,[Measure_Value1]<_avgMargin && [Measure_Value2] >_avgDisc))
            )

If not, maybe try eliminating some CALCULATE statements:

Measure = 
    var _avgDisc = CALCULATE('Midpoint1_X Axis'[Midpoint1 Value],ALL(Data))
	var _avgMargin = CALCULATE('Midpoint2_Y Axis'[Midpoint2 Value],ALL(Data))
        return 
            switch(MAX('Table'[Category]),
                "A",COUNTROWS(FILTER(Data,[Measure_Value1]>_avgMargin && [Measure_Value2] <_avgDisc)),
                "B",COUNTROWS(FILTER(Data,[Measure_Value1]>_avgMargin && [Measure_Value2] >_avgDisc)),
                "C",COUNTROWS(FILTER(Data,[Measure_Value1]<_avgMargin && [Measure_Value2] <_avgDisc)),
                "D",COUNTROWS(FILTER(Data,[Measure_Value1]<_avgMargin && [Measure_Value2] >_avgDisc))
            )